Update README.org

README.org

@@ -41,6 +41,9 @@ There are a bunch of demo scripts and datasets provided by the package:
 #+begin_example
   demo(package="RedModRphree") ## displays a list of available demo scripts
 
+  ## A simple Pourbaix diagram 
+  demo("demo-Pourbaix",package="RedModRphree") 
+
   ## CAUTION: these take 1-2 minutes each
   ## some platform-independent parallelization is activated by default
   demo("demo-equilibrium",package="RedModRphree")